4.3.3. Viscosity

An Ostwald viscometer size D was used to measure the viscosity of the AVG at 21 ◦C, which was calculated using the following equation:

$$r\_1 = \frac{r\_2 \times p\_1 \times t\_1}{p\_2 \times t\_2}$$

where *r*<sup>1</sup> = viscosity of the gel, *p*<sup>1</sup> = density of the gel, *r*<sup>2</sup> = viscosity of water, *t*<sup>1</sup> = gel descent time in seconds, *p*<sup>2</sup> = density of water, and *t*<sup>2</sup> = water descent time in seconds.
